Appliance makers could build the simplest possible appliance, then build a simple monitoring system (like OBD2 in cars) to tell us what is wrong. They could eve

Appliance makers could build the simplest possible appliance, then build a simple monitoring system (like OBD2 in cars) to tell us what is wrong. They could even agree on a standard interface so anyone with a computer or phone can see the live data and diagnose bad sensors. They could make that OBD2-like system relatively secure by having it only sense and report without being able to make adjustments or screw things up. They could make it so you can tell the appliance to ignore a bad sensor, so we do not get OBD2-like problems where bad sensors are more common and more expensive than real problems. Nobody has done it, yet. I have hope for the Chinese to figure this out and create a national standard.